Well, IMO, Green Lantern is a decent game, but it's particular style of gameplay is getting a bit old. While I'd say MetroidVania style games are some of my favorite on the DS, even I get a little tired of it when a company keeps regurgitating the exact same formula over and over. Griptonite hit gold with this style of game with Spiderman WoS and a few others, but anymore, they are just milking it without really adding anything new to it, other than a different comic book character's visage. So again, it's a nice game, just a little stale if you've played their previous releases. Also, the game is very dark, you'll be wanting to bump up the brightness while playing just so you can see it. DSphat users will really have a hell of a time trying to see in this game unless they play it in a dark room somewhere.

Solatorobo: Red the Hunter seems like a good quality action RPG. I kinda wish there was a little more to the battles than just wailing on A all the time....or more to the point, I wish they would have at least given you the option to abuse a different button than A, since that is the first button on my original DSlite to die (contact pad under the button is completely worn out). Still, a little more variety to the battle system could have made the game much better. But it has pretty good graphics and is a welcome addition to the DS library in the face of the onslaught of shovelware we've been seeing lately.

One Piece: Gigant Battle.....hmm. I can't really comment on this game since I haven't played it.

As for the thread creator. I suggest you take a look at the release list for DS games and if you see a game that looks like it might be interesting to you, read the discussion for that release and see what people are saying about it. No one can really tell you what games to play as everyone's taste in games is different. Besides, you didn't state what types of games you prefer, which can really help a lot when asking for suggestions.